Famous Jazz Duets for Trombones Vol.1,2 & 3 (Neuheit Posaune) Randy Aldcroft has written three volumes of wonderful Jazz Duets for Trombones in all keys. These Duets were written for the intermediate and advanced student interested in playing Jazz. The range of notes gets higher and the duets get harder with each volume. The chord changes are included to help learn the structure and chord progressions, allowing the Duets to be played with a rhythm section if desired. These Duets are perfect for the student and teacher to work on at lessons, and several of them can be programmed together as a medley on a concert or recital.